How about changing the balcony of the house into a gate? Should I pay attention to anything?

A complete feng shui needs to look at the head of the phoenix and control the qi. You asked about the weight. Generally speaking, the apartment is square and good. See two questions for reference only:

First, the built-in bathroom in the bedroom is a popular apartment now, but it is not a good feng shui, because the bathroom is a place where Huang Yi does evil, and the bedroom is a place to rest, which will affect the health of family members. The solution is not only to keep the bathroom dry, but also to hang the gourd upside down above the sewer and plant aquatic plants.

Second: it is not clear whether the kitchen stove and the toilet are right on the picture, which is also bad feng shui. It is recommended to stagger the decoration.